Merge pull request #1254 from lightninglabs/dev/fee-est-err-msg

Add fee estimation failure details to error message.

Author: tanx

src/action/payment.js

@@ -246,7 +246,10 @@ class PaymentAction {
       }
       this._nav.goPayBitcoinConfirm();
     } catch (err) {
-      this._notification.display({ msg: 'Fee estimation failed!', err });
+      this._notification.display({
+        msg: `Fee estimation failed: ${err.details}`,
+        err,
+      });
     }
   }